The cosmic microwave background radiation permeating the universe is the afterglow of the Big Bang, 13.8 billion years old.
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The observable universe is about 93 billion light‑years wide.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The International Space Station orbits Earth every 90 minutes.
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